Rotary compressor impeller



Aug. 30 1932.

A. MEYER 1,873,974

' ROTARY COMPRESSOR IMPELLER Filed June 1. 1929 Fig.2.

Inventor Adolf Meyer i is to provide an impeller Fatented Au so, 'ieszUNETE' TAE'ES israera ADOLF MEYER, 0F K'USNACHT, NEAR ZURICH,SWITZERLAND, ASSIGNOR TO AKTIESF- GESELLSCHAFT BROWN BOVERI & 0113., OFBADEN,

COMPANY OF SWITZERLAND SWITZERLAND, A JOINT-STOCK ROTARY COMPRESSORIMIPELLER Application filed June 1, 1929,

This invention relates to improvements in centrifugal blowers,exhausters, compressors and the like, and, more particularly, toimprovements in the construction of the impellers or wheels usedtherein.

A centrifugal blower, exhauster or comressor in general consists of aplurality of fluid propelling or impelling wheels keyed to a shaft, theshaft and wheels rotating within a casing to which are connected variousappropriate control devices. The design and construction of the impellerwheels is determined by the speed at which the wheels must be rotated toobtain the desired quantity and pressure of the fluid to be delivered.Heretofore such wheels were constructed either from a number of integralforgings riveted together or the several portions of the wheels wereformed from several members which were either welded or riveted toobtain the necessary unitary construction of each wheel. It has beenfound that the stresses created by the-centrifugal forces inherent ineven the most perfectly balanced rotating wheels are of such magnitudeas to require substantially more massive constructions than aredesirable from either the view point of constructional or of operatingeconomy.

Such centrifugal action machines as blowers, exhausters, and compressorsare inherently high speed machines and it is therefore desirable thatthe rotating masses be kept as small as possible to decrease thecentrifugal forces arising at operating speeds. Reduction of weight withan increase in the factir of safety are accordingly greatly desire Itis, therefore, among the objects of the present invention to providecompressing or impelling wheels for centrifugal blowers, exhausters,compressors or the like which is so constructed as to materiallydecrease the weight and increase the safety thereof. A further object ofthe present invention wheel for centrifugal blow'ers or compressors inwhich the construction of the wheel together with the balancingoperations required in testing the same are so simplified as tomaterially de Serial No. 36?,650, and in Germany Iune4, 1928.

crease the cost of manufacture of such structures. 1

Another object of the invention is to provide an impeller wheel forcentrifugal blowers or compressors in which the several portions of thewheel are securly reinforced against centrifugal forces arising therein.

Objects and advantages, other than those above set forth, will beapparent in the description and the drawing in which Figure 1 is aperspective view of an impeller wheel for a centrifugal blower,exhauster, compressor or the like embodying the present invention, and

Fig. 2 is a vertical cross-sectional view of Fig. 1 taken on a diametertherethrough.

Referring more particularly to the drawing by characters of reference,reference numeral 8 indicates a side disk member having a hub portion 4centrally located therein.

The hub 4: may be formed as a separate member fixed to disk 3 but it ispreferably integrally formed therewith to provide greater strength witha substantial saving of material and weight. The hub is arranged to besecured to the shaft (not shown) of a centrifu ner.

The edge of the inlet port in disk 6 is turned over to provide aconstruction which will have the lowest possible resistance to the flowof a fluid therethrough. Due to the centrifugal stresses arising in theimpeller wheel,-it

is absolutely essential that the disk 6 be substantially reinforcedabout the edge of the inlet port. Such reinforcing'was heretoforeaccomplished by use of a massive inlet reinforcing ring which was formedeither as an integral portion of disk 6 oras a separate member securedthereto. According to the present invention, an inlet disk reinforcingring 8 is arranged within the semi-circular,

channel formed by the turned over edge of the inlet port through disk 6in such manner that the ring is firmly retained by the disk withoutrequiring any additional fastening means.

When a centrifugal blower or compressor is in operation, the severalwheels rotate at high speed which creates centrifugal forces of greatmagnitude. Unless the several portions of the wheels are of suflicientsize or are properly reinforced, the forces created will destroythewheel. The wheels cannot be made of such size as to resist thecentrifugal forces without reinforcement because of the massive size andweight required. When the reinforcing members are merely fastened byriveting, the tendency of the rotation is'to cause loosening or shearingof the rivets. But when the one disk of the wheel is made as an integralmember and the metal of the other disk actually serves to retain its ownreinforcing ring, the wheels may be almost perfectly balanced and thecentrifugal forces created can be resisted by smaller masses than isotherwise possible. The amount of labor and material required inconstructing each wheel may therefore be reduced-and lighter weight, andcorrosion resistant materials of lower tensile strength may be used.

Although but one embodiment of the invention has been illustrated anddescribed, it will be understood that various other embodiments arepossible, and that various changes may be made without departing fromthe spirit of the invention or the scope of the claim.

The invention claimed is:

In an impeller wheel for centrifugal machines operating on a fluid, adisk having a ortion thereof formed as a hub, a disk havmg an apertureopposite the hub portion on said first mentioned disk, a reinforcingring secured about the aperture through said second mentioned disk, saidsecond mentioned disk being formed about the said ring to retain thesame, and blades connecting said disks.

In testimony whereof I have hereunto subscrlbed my name this 10th day ofMay A. D.

ADOLF MEYER.

